Not all birds have a constant body temperature, but most do. Like mammals, birds are homeotherms, which means they can maintain a relatively stable body temperature regardless of the outside temperature.
The normal body temperature of birds is usually around 40°C, which is higher than that of humans and other mammals. This high body temperature helps increase the metabolic rate and athletic ability of birds, allowing them to remain active and agile in various environments.
However, not all birds have a constant body temperature. Some birds lower their body temperature to save energy when they sleep or rest. For example, birds such as nighthawks lower their body temperature to a temperature close to the surrounding environment when they rest during the day, thereby reducing energy consumption.
In addition, in cold seasons or high altitudes, some birds also maintain their body temperature by shaking their muscles and reducing their body surface area. These adaptations help birds survive and thrive in extreme environments.
In summary, while not all birds have a constant body temperature, most do maintain a relatively stable body temperature. This high body temperature helps increase their metabolic rate and movement capacity, allowing them to remain active and agile in a variety of environments.
